Greetings,
I recently bought a lightly used Paxton 1220 SL and plan to put it on my '91 GT. The blower cam with both the original 3.8" pulley (~6 psi) as well as a 3.33" pulley (~10 psi).
The car has 50k miles, the engine has the typical H, C, I upgrades as shown below and makes ~290 hp at...