my daughter and I are building up a '64 ranchero to be ready (hopefully) by the time she gets her licence(we got 2 1/2 years). The frame and floor are shot so we got a s-10 frame to use and rebuild the floor and firewall. I have the straight 6 200 with a manual tranny. I started thinking about the full frame of the s-10 , the disc brakes and thought maybe I should put a bigger engine in it. The ranchero will be my daughters first car so I dont want it to get her in trouble but I do want it to be fun to drive. I have a 300 straight 6 with a 3 speed w/ overdrive I could use. Havent made any measurements but I will be redoing the firewall anyway so it seems I could make the 300 work. My main question is the 200 enough of an engine for the extra weight of the full frame and be responsive enough to be fun to drive? Any reasons I should not use the 300? Thanks for your thoughts.