Towing with a small block

[kwmech]

So my 91 Suburban has the anemic 350 TBI engine with about 160k on the clock. I've done gearing upgrades along with swapping to 1 ton axles and 4.56 gearing, along with that is going to a 4l80e with a stand alone controller. Was thinking of going with a stroker kit. I see locally somebody selling a 94 suburban with a 454. It would totally bolt into my squarebody and all the parts are there for the conversion aside from having the exhaust cleaned up. 454 has about 50k on it while the whole 94 burb has 180k on it. Don't know the specs off hand on the 94 big block, but I know I'll get probably twice the amount of torque I need, but the mileage may really fall off. However at the same time the mileage on the 350 isn't all that great toting this aerodynamic brick around with another brick behind it. Thoughts?? An Ls conversion is really not in the cards being california and smog nazis I'd have to deal with.

[mongocanfly]

My C30 had a 350 in it, it could barely get out of its own way..
I started looking at engine upgrades,
Kinda wanted a dmax, thought about a BB,
I like their torque numbers and where they hit
But at that time a dmax was a very expensive swap,
and I couldn't find a BB,all the dragracers were hoarding those.
So I went LS..even with the numbers it puts out,sometimes it leaves a little to be desired..
But I pull some hefty loads with it, and when I do the mpgs don't exist..
I think you'd be happy with the BB..except at the pump..

[kwmech]

I get that as my flatbed has a 454 along with my longhorn. The Suburban gets about 12 when I'm towing and going easy on it. I'm think the BB won't be that much of a change mileage wise since it won't be working all that hard to accomplish the same thing. The complimentary drivetrain is already there, they're both TBI. 94 suburban is 3000.00. I'm thinking I can yank the engine and part the rest of it out and get my money back. Just what I need is another project to take on this year.