Muffler selection

Purchase the H pipe and the longer mufflers together and install at the same time to save yourself from a lot of extra work.

When you measure for the max muffler length area available, I basically starts at the front where the floor rises of course but you can make for some small allowances at the axle. Where ever the muffler bracket comes straight down is the max rear wards distance.

Im not sure what the A bodies offer but my late B body housed the long Dyno Max Turbo muffler well.