[jocko]

For V8 options, 66 came stock with a 283 or 327, so any small block chevy will easily fit (and all accessories, etc are easily available) - so, 283, 327, 307, 305, 350. Easiest is a 350 since they practically grow on trees, but a 283/327 of somewhere mid-60's vintage is a cool addition. If you're not up for a rebuild yourself of the junkyard small block, a crate engine is probably right up your alley. In addition to the above stock cubes, crate motors are generally found in a 350 or 355 (bored 350) or 383 (bored/stroked 350). If you go crate, 383 is a vrery good option. Recommend a head to toe (carb to pan) running engine since you you won't have the add-ons (water pump, distrib, manifold, carb, etc etc) to swap from you 6 cyl. You may still need to do a little shopping (or a large swap meet usually has refurbished ones) for some a/c, alternator, and power steering pump brackets (if you're running any of the upgrades like ps/a/c, etc). You will need V8 motor mounts, and they should bolt right into your frame and onto about any small block. Personally, I'd swap the tranny out too - if you're looking for a driving machine - the powerslide auto or stock 3/4-speeds leave a little to be desired in my opinion. Remember, you've always got the forum to ask the stumpers you run into - guaranteed someone on here has an answer. No guarantee it's the RIGHT answer, but, you get the idea... Only way to learn is to dive in. Sounds like a blast, good luck!