True horsepower?

for reference>
'71 stock 340 Cuda........3600lbs+/-? with me
stock bottom end with .039 fel-pro's so poss/prob 10:1 or under.
add> ally dual plane intake,
add> 750DP Holley
add> .484/284 purple hyd.
add> small tube hdrs.
add> 3500 converter
add> 8x26" M&H slicks, 3.55's
add> MSD6A
best ET/mph = 13.28@101
= 302 fly hp
All runs made at SPR...