Spring offset and rim and tire size 68 Barracuda for thos who have done it

I'm thinking of moving my SS springs in with the 3/4 offset spring relocation kit. Don't want to mini tub. Right now I'm running BFG 255/60 15's on 8" rims with 4.25 backspace.
Input on what combination tire and rim backspace you guys who have done it to a 67-69 barracuda are running would help a bunch in my final decision.
MY 3/4 '' OFFSETS ARE 3/4''. THERE IS A SMALL AMOUNT OF TROUBLE GETTING THEM IN , IN THE FRONT. I HAD A DANA 60 WELDED UP W/ SPRING PADS WELDED UP 3/4'' CLOSER TO THE CENTER, THAN A STOCK A BODY REAR, IT DROPPED IN PERFECTLY. THERE WERE 3/4" OFFSETS MADE BACK IN THE DAY. I STRETCHED MY FRONT WHEEL OPENING TO FLUSH W/ THE INNER FENDER WELL, IN THE ORIGINAL SHAPE. AM RUNNING 295 65 15 DRAG RADIALS, ON MY 68 FORM S FASTBACK. LOOK AT MY AVATAR PIC. FINDING THE OLDER 3/4" SET UP MAY BE HARD TO DO, I LUCKED OUT. BOUGHT THEM OFF A GUY ON HERE THAT SAID THEY WOULDN`T WORK ON HIS CAR----------------------BOB