This is what you need, about $200 each, perfect on the 7" rim. And they are 26" diameter.
This is about the best you can get to go with the 3:55 gear.
I race mine at 24 - 26 psi. Find the highest pressure that still hooks and be good to go.
could it be the timing at this point? OP mentions rotor lined up at TDC. Was distributor moved around? Maybe try a timing light on # 1 while cranking, see if you can set timing.
Crank whille jumping, or use a charger with a boost.
I have the ET street radials on 7" rims. 73 Dart Swinger. With an 8 3/4 rear upgraded to big bolt (slightly wider) I had to roll the wheel well lips. If you are using standard width rear it should clear fine.
I think you will be happy IF you gave PTC the correct information, and intended use.
25 -2700 sounds perfect for a mild 360. Don't know the rest of your combo, but sounds like a 3:23 gear would make a healthy streeter.
Congratulations Tom.
My yellow Dart got Sportsman runner up on Saturday, and the Sportsman, plus Mopar Max Street Trophy win on Sunday. Fun time at Cedar Falls.