Clifford is the last place to go for parts. I built my 66 Valiant for about $1500 including buying the car. Granted it is a drag only and not a great body, but it does run low to mid 13's in the 1/4 mile (should be in the 12's).
My Cuda has a 170 engine, and is street legal. Runs about the same, but I have more invested, but not a ton.