sorry, let me give you the A/sedan rules quick:

306 cid max
flat top pistons w/ 10.3 cr max
gt-40 iron heads, gasket match only
.500 lift max. solid flat tappet cam
performer rpm mani. w 600 cfm holley list #4776 only
no shaft rockers, alum. fly, steel cranks
crower or eagle rods ok

tremec, t5 or toploader trans w/ spec ratio
9 inch allowed
16X8 inch wheels
3180lbs for fox, 3280 for '94- up

gm's have similiar rules for camaro and firebird