+2 on the 87-92 4L60 deal.
We have several customers using 4L60's with zero issues anyplace. One in particular has a 69 Chevelle with a 500hp 454 engine and has logged over 50,000 miles and the car is raced frequently. I would use an 87 or later unit, as they already have all the upgrades. A 4L60E would be equally as good, but will require electronics for shift function.
Most folks with BOP engines go the 200-4R route as they have the correct bolt pattern and don't require an adapter. They are more costly to set-up than the 4L60's being pretty weak in several areas.
All of them can be set up for lock-up, although I prefer to use non-LU converters to simplify retrofitting. I've ran them both ways in my own vehicles and they just work better all the way around if an efficient well chosen converter is used for the application.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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