85 heads are E5s and no it isn't even worth porting them for free since you'll have to buy new HGs, head bolts/studs etc... to swap them.
As for a 6A box, they work but if you ever open one up and look inside at the guts you'll be looking at what looks like a 6 yr old went at some circuit boards and wires with a hot glue gun. Its pretty awful... get a Crane Hi-6 box, THOSE are actually built well and are smaller and don't make any noise when they're on like the MSD boxes do.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.