I'm with Lynn - especially in light of the four speed as your left foot can regulate your stall speed if you will.. In that he (Lynn) has real life experience with a motor that's similar I don't think you can go wrong with his recommendation..

If stock appearance wasn't important, Tango's got it nailed and trust me - you'd definitely notice another 50 ft/lb of torque in a 66 Nova.

Let us know what you decide - I'll be curious to get your reaction after your initial test ride..

Regards,
Glenn