I am getting a quote on a 383 crank and machining but, it ain't cheap (none of this is) unless you go with junk builders like mentioned on earlier posts. The Blue Print 383 short block starts @ $4199. Whatever I do, this is the last time I wanna have toEither stay with a 2-bolt 350 and close the door on future power upgrades, or go 4-bolt 383. It's cheap, right now. If you're not feeling it, I get it, but if you feel froggy, jump! I agree with @L31MaxExpress that your cam will be a little tamer in a larger engine.
Yes, that's part of my decision making. With 170cc runners, it'll be a torque monster but not so much on top end. My 46mm Throttle Body probably won't be big enough for higher revs either but, the 50mm off a 7.4L will. These are all considerations I need to look at and weigh. The builder also mentioned splayed main caps for my 2 bolt block - just that much more in parts and machining.I think the big question is if you have the same cam and heads, will a larger displacement be more taxing on the TBI?