I have 1969 panel I am working on. Yanking the 3 on the tree. I have a 4l80e thats is in fine shape. Install pretty simple. Have to buy controller for it and seems about grand.

Looking at 700r4 as possibility . Avoid cost of controller, lighter and figure eaiser to rebuild. Think cheaper to hop up.

Engine is mild 489 ci BBC street cam 10:1 carb(efi later_ with edelbrock aluminum heads. Maybe hit 450 to 475 and guessing that a push.

More concerned with it living up to me than the engine. Not know for being easy on anything.

Looks like 700r4 can handle power with some work. Opinions on choice and good or bad points either.

I tend to be hard on my stuff too. If it was my project I would go straight to the 4L80e. It’s a bigger stronger unit to start with. I gave up on 700R4 in my old s10 blazer street truck. A mild 350 small block would eat the 700’s up if I drove it anyway hard. Maybe I just got a bad one I don’t know.

TH400 with a 3.08 gear. Save lots of $$$, go beat the crap out of it, and never worry about breakage. JMHO