Jim, to my knowledge, the only 396 '67 Chevelle that I've seen around is Gordon Merkley, from the Northwest. It was a 396/375 in SS/F. There have been a few in Stock, but not sure how many of those are left. Most 396 Chevelle's in Stock are 1968 and newer. Here are the classes for the 396 '67 Chevelle in Super Stock.
396/325. Now rated 358 by NHRA. Fits naturally into SS/H (both coupe and convertible, with any trans, all four fall into SS/H), and can also run G and I.
396/350. Now rated 355 by NHRA. Fits naturally into SS/G with the SS hardtop, and can also run SS/F and SS/H. One class lower in each with the convertible (would run SS/G-H-I_
396/375, stick only combination. Now rated 395 with OEM head, 405 with replacement head (401 A1 head accepted as replacement head). 2 door hardtop fits naturally into SS/E, and can also run SS/D and SS/F. Convertible will run SS/E-F-G
For minimum weights for the car, take the "top" weight break in each class (for SS/G, it would be 9 pounds), multiplied by the NHRA-rated horsepower and add 170 pounds, to arrive at class min weight across the scales, with driver.
SS/G 355 x 9 + 170 = 3.365 pounds with the 396/350 now rated at 355.
http://www.nhra.net/tech_specs/class...s/1967CHEV.xls
Hope this helps.
Oh, and to answer your question about which motor would be better, I'm a young, dumb kid who used to race a FWD Stocker. You'd have to ask a RWD V-8 racer that question. LOL But the 395/325 has been pretty fast in '67 and '68 Camaro's in S/S. Hence the rating now at 358.