In addition to the displacement difference (230 / 292 = +27%) and RPM range (5,000 vs 7,000), the Sprint is a 12 port engine with very different activity in the intake ports. Don't count on it being a close match out of the box. I suspect the high speed air must be tweaked.
The 390 has 1-7/16" throttle discs and 1-1/16" venturis
Sorry, slipped up on AFB, must remember not to trust memory more than 50 years.
