What are your trying to accomplish?
I have been 60 mph with a 55 model 235 in a 4,400 lb truck, it's not the engine at that point but the gearing that limits speed, faster gears would allow me to go faster, to a point..
However, if I were to throw in another 4,000 lb the engine would then be lacking power, and slower gears would be good.

If you put the engine behind the cab.. then your COE turns into a CIFOE (Cab In Front Of Engine) ohwell

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-