Here's my two cents. I would say if you are going to go through the troubles of a swap, just start with a V8 car instead. That way money spent will be to improve on the V8 instead of converting everything. $5,000 will go a little farther on an I6 and with the lighter weight up front you can have an excellent handling car. I may seem a little biased towards the sixes as my 66 has one, but I just think they are cool little engines that are often overlooked. Like Mercury said, Clifford Perf. can really wake those engines up. The choice is yours but I would say keep the six and dress it up. You'll have a good paying job soon enough and you can just buy a cherry 289 Stang and have the best of both worlds
BTW, before I started working on my I6 I didn't know that much about cars. The six is a great way to get your feet wet and parts are very cheap!
Good luck
Brett
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66 Tahoe Turquoise Coupe
Laser Red 96GT Ragtop
30 Years & 30 inches apart in the driveway!