Too many variables to your question. You already know this, can you drive it? Will it hook and go?

Buy an R3W8 motor or an R5P7 (that would love a manual trans) for 5-7k and away you go. You can't try to add in the cost of fuel and ignition system since the big block would need that too.
There, you got an answer, I'm not going to map out an entire build.... how would you be 3700 with a SBM tho?? Sports Fury wagon?? Lol