Me and my dad are working on an automatic 1965. we pulled the i6 out of it and planned on bolting a 289 out of our parts car right in and driving..ha it's never that easy. The parts car we bought is another 65 with with a 289 and a 3 speed. Well we bolted the engine in and two cylinders weren't firing so off to the machine shop where they bored it .040 over, put in a mild cam and cleaned it up, and now we gotta hook it all back up. Once we get it hooked up the issue of a transmission comes into play. The c4 (i6) auto doesn't bolt up to the 289 and my dad doesn't want to use the 3 speed for fear of all the work the conversion is going to need. He got a c5 where where we ran into more issues of everything matching up.what should we do? my dad had the idea of drilling our own holes to use the bigger torque converter on the smaller c4 so so it will work with with the 289. can the c4(i6) handle the somewhat beefed up 289 If we can rig it Up? Or should we explore explore other options? picture of the car if anybody is interested and thanks