Originally Posted by Z284ever
Mostly the cam.
Normal smallblock mods can easily bring a 305 to that power level.
yup, cam. for 88-89 the AT cam is .350/.384 179/194 109.0 LSA
the cam for 350/305 MT is .415/.430 207/213 117.0 LSA.
in 87 the AT 305 TPI is the same and for the 350/305 MT the numbers drop just a tad but not too much.
88-89 had the largest cam of all years for the TPI.
as for mods, headers are the single best large mod you can do for a TPI.