holley 650 jets

I have a 4777 on my mild 360 340 cam and headers and alum dual plane intake. had 68 jets in front and a unknown (no markings?)power valve. Just running a little rich and wondering what everyone would suggest as a good starting point for jets and power valve. i have 74,67,64, jets and a 3.5 power valve. I live in the Fortworth TX area now so I'm not sure what the altitude is here but I'm sure its not to high. With the price of gas I'd like to run as lean as I can without hurting the motor. I left my vacuum guage behind so I guess I'll have to get another one of those. any sugestions?
Author: admin