The smaller FE motors are fucking tough as nails. It will take a 250 shot,
I'm pretty sure it'd take more. Stock 302 take 200 shots if you stud the heads and mains to reinforce the flexi-flier blocks, and this is old school jet-by-the-seat-of-your-pants and generic retard era tech.
That's why I said take that 250 shot, and laugh at you.
I know it's apples and oranges, but I've witnessed a stock bottom end cadillac 500 take 300hp worth of spray and the same engine in a fox chassis with nothing more than valvetrain and breathing mods went deep in the 9's. (lux lx's budget fox)
As far as mixing stuff, the intake SHOULD work. All the FE's (and FT's) have the same deck height, and bore spacing. But why would you? Just find a 460 in a yard, re ring, and throw in some bearings, a n20 plate, and spray that slut until you cross a finish line. If you have a good junkyard like we do here, maybe find a LARGE oxygen or equvilant tank for n20 storage. Fuck that 10 and even 15 lb bottle shit.
As far as the slushbox, a c6 with minor valvebody work would be more than adequate for what you are doing.