All of the Brockways have butterfly hoods except the later 761's had a tilt hood. I cant say whether the V12 would fit, but with a little finess anything is possible. Most 1:1 trucks with a V12 had an extended hood. The V8 would definitely fit. As for opening the hood, your going to have to cut it apart and hinge it, or just cut it so the hood will lift off from the fenders as one piece. A V engine would have dual exhaust, an inline 6 diesel would typically be single but many have it split into dual. The best way to get your exhaust is from the trading post. Im sure I have leftover V8 exhaust from the Peterbilt kits. The Super Boss kit is currently in stores, and has the Detroit V12, but has modified racing exhaust. With a hobby lobby coupon its worth picking up. The resin cab is a little thicker than a kit cab, so you may want to just cut the hood off and make a new one from sheet aluminum or something like that. The Brockway hood shape wouldnt be too difficult to replicate.