building my 65
Well I will try with the info you gave.
I would start with a T-5 and some 3:50 gears or better. If you do a lot of freeway stay in the 3:50 range, with a T-5Z you will still get good milage and good performance in the 1st 4 gears. I use 4:11`s with mine and still get decent milage and decent rpm at 70mph. A new T-5Z will run about 1100$ install will require a cross member, mount, Bellhousing, a driveline change, so there is a couple hundred more. A good dual,exhaust system is a must, at least 2 1/4. A performer RPM with a 650 double pumper will wake up any 289/302. A new RPM is 200$ and a carb well??? depends on what you get and from whom. A pair of iron GT40 heads are reasonably priced these days used, 300-400??? these pack bigger valves and you can interchange them with your existing parts. you can aluminum this will take 50lbs off the front of the car, which you will most definetly feel, and add significant HP over stock heads, new about 1200 will get you going just for the heads, but you will need rockers and pushrods. $$$$
It is always best to put on paper what you want to do with the car then work from that. Then put together a matching combo that will work good and give you what you want. In this hobby you rarely get your cake and get to eat it, there are always sacrifices to be made in comfort, noise, cost, reliability.
If you want to run 13.5 in a 3200lb car you will need around 260 HP or so at the tire, this is not hard to get these days, but then we come back to sacrifice and $$$$$$
This horse runs.