Trick flow heads how are they ?

I have access to some 4:10's and I'd be open to a new stall convertor. I had 27 inch tires on with the 3:91 gears and I wasn't even hitting 6000 crossing the stripe so I dropped to a 26 inch tire and crossing at 6200 now. This is going to be fun, I love testing and tuning. When I first started racing with this combo I was running 13.1 to 13.3. Did some tuning, super stock springs, new rpm air gap intake, 3 inch exhaust with super 44's dumped at the axle, new slicks and was hitting 12.3's consistently. Plus I learned how to drive from some cool old school racers