Capt Troy, nice pictures of you're boat I had seen some before and wondered how the interior looked.
I haven't posted much before but thought I'd weigh in, I agree the B35 is an awesome boat (disclaimer: I've owned a B35 for 7yrs now). Though if all you're doing is fishing it's hard to be a B31 for simplicity and fishability (several different layouts).
Another older hull which you didn't mention is the B38 which actually preceded the B37 and came in 2 stateroom layout with a cockpit close to that of the B35.
In 2007 I repowered from gas to diesel, 454's to Cat 3126TA's 420hp. I've not played with the props to get the max out of her yet, but with help from some others I got decent numbers the first time out. I went with 21x26 cupped and turn over 2900 on the top end; cruise 22kts @ 2100 or 26 @ 2600 topping out at just over 30kts wot. I'm sure I could do some prop work to get better numbers but I'm happy with what I've got for now and don't like wasting thousands chasing a few kts.
So, with any of these older boats, I'd look for a good solid diesel boat to start with, either original or conversion(done right). With the market today, repowered boats are being sold for pennies on the dollar.
From my own experience these older boats are pleasant at a 25-27kt cruise some seem to nose over past 30kts so some shaft angle work may be necessary?? As for power, cummins 6bt's or yanmars is a good option for the B35. The CAT's 3126/3116 up to 350hp are also ok as you can go with the ZF201A's (10degree down is the ticket), go over 350hp and that’s above the 201A's rating for mine I had to use 280A's and had to raise my salon floor about 1.5 inches. If your goal is to cruise at 35kts and top of 40kts in this class of boat maybe an older Bert isn't your ticket. If you can live at 25kt cruise then you're on the right track.
The one wart in most older berts is the genset under the cockpit which requires a little more tlc to keep it from turning into a ball of rust.
As for B35's from 1971 to 1980 they had the smaller bridge and only one state room and the salon was mostly open with a half counter to port and optional lower steering to stb and a center door in the aft bulkhead. from 1980 on, the bridge had seating in front and a day-birth along with single stateroom also the salon has a full length counter on the port side and the door in the aft bulkhead is on the port side. Mine's a '73 and I like the open layout of the cabin and having the lower helm.
These boats will handle more than you can for sure. Though I don't go off shore a lot, in 2006 I was on my way to the Atlantic City rendezvous and caught the tail end of TS David. I came out of the Atlantic side of Cape May attempting to head north to AC and was greeted by 6-10 footers (in the trough I was at or below the crest of the next.) I didn't go far before turning around, this was a pleasure trip and I opted to lay over another day. The trip left me with a new appreciation of the capabilities of my boat, the next year I repowered.
Check out
www.bertramrendezvous.com for some picks of all different models.
br,
JohnD