Older 302s are very easy motors to upgrade. Put in a higher lift cam, a decent intake, a good carb, optional on the heads. Being a 70, they are probably fairly good flowing heads, but its an option. Finally, bolt it all to a high-flow exhaust and enjoy. It is almost essential to replace the points-style distributor. Go for a late 70s/early 80s solid state or a MSD box if your going all out. This should bring your motor a lot of life. However, if you do a compression test and get low compression on many cylinders, you may have to rebuild. In that case, go for the Stroker kit. Hope this helps.