BB or SB, That is the question!

[69GMC910]

I haven't been active on this forum for a few years now because I parked my truck engineless a while back... Needless to say my love of the truck has been re-ignited and I'm going to do the truck up again! Today, I was offered a 69 with a 327/th350, and a 70 with a 396/402 with I assume, a th400 both for $300!! The body's are junk on them, but the guy figures one might have bucket seats (whether they are original or not I have yet to see...) I figure I will pull the disc brakes off the front of one of them and put them on my drum truck, hopefully power brake booster etc...

The big question is, do I ditch the 350 (not original)and powerglide that was in the truck and go to the BB?!

Obviously, it's much more expensive to build a BB. Is there a lot more cab noise with one? What about heat in the cab versus a small block? Mileage I don't care about...

I realize I may be getting a donor BB truck, but what has to be swapped besides motor mounts when you go from sb to BB?

Thanks, and it's good to be back!