Should I chance it?

I was using 20% gross to net and then 20% automatic trans factor (and guessing).
Cam lift math should be correct though, eh?

80s stangs would use net HP figures natively, right?

Most 70s Mopar guys I know still use gross ratings.

If you can get a complete 5.2/5.9 for cheap and resolve the induction and balance issues, sure.

My 2000 R/T has 250 NET HP (which calculates to about 315 gross/crank HP), and will BOIL the ($200)tires off my 4200lb truck with 3.91 SG. Piss poor 16 sec 1/4 mile, though.

A 92 5.2 IIRC has 245 net and has 2.5 inch exhaust manifolds (vs 1 7/8 ) and a slightly better cam.
Torque of 5.9 comes on earlier, though.