I think the 65mm s/c pulley puts out less boost than the 181mm crank--the pulley that's giving me my lean issue above 5k RPM right now--so you should be ok. Double check into that. If you're going for a high-mileage SRT like I am, the s/c pulley won't overdrive the accessories like the larger crank will. As far as engine life..what's your driving style?