USCG approved parts?
Fuel pump, yes
Flame arrestors, yes.
I think that's about it. All of these would fit a 396 or a Mk IV 454.
Likely half of this wasn't USGC approved when it was new.
I'd check block casting numbers to determine...
What's to know?
Same stroke as a 427, at 3.76".
Smaller bore tho.
Same physical size as a 427, 454, 496, 502, etc.
Early 70's Chevy 396's had a 325, 350 and 375 hp versions.
Guessing on how much hp a 396 is in a 40+ year old boat is nearly impossible.
A stockish 325 hp should be 50-ish mph. A...
From hwy 93 south, head West at hwy 68.
Turn left (south) at Aztec Rd. Follow to first stop sign.
Turn left (East) on Shinarump Rd. Follow to I-40. (Rt 66 Shinarump exit/ interchange, exit m.p. 44)