I want to get my rig to around 330-400 hp. It is a 1986 350 with about 120K miles (odometer isnt correct). Its stock except for the usual K&N air filter and exhaust. Do you think it would be better to beef it up or swap in a crate motor? Also, I live in the Bay Area of CA so smog is very strict. So emissions is a huge deciding factor. Any ideas? Any advice would be appreciated. I was thinking a HP cam and carb to start it off. 1986 GMC Jimmy 6" springs 3" body, 38/15.5/15 Swampers, 14-bolt FF rear, Dana 60 front, 1991 front-end.