There is a guy over at StangNet by the name of Thumper460 that sells ported E7's that make real good power that would work on your 86 block. They are relatively cheap (under $500) and if I remember, they flow more and make as good or better power than the PowerHeads do.
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1991 Mustang GT - Cobra Intake, FMS 65mm TB, C&L 73mm MAF, GT-40P heads, Crane 2031 cam, Crane 1.7rr, Built AOD, Art Carr 2400 non-lockup converter, Transgo shift kit, BBK chrome cold air, FMS 'P' headers, Pacesetter off-road H, BBK aluminum pulleys, 2-C Flows w/ dumps, 4.10's, Steeda STB, for now...
The Original GT-40P Tech Page