Can't burnout:(

you said your heads have port work and eddie intake, if its a high rise or a big intake you have loss massive bottom end compared to before. ive run many 318 both 2 and four barrel 3.23,s all able to spin tires. now i have a 273 that sounds exactly as your 318 gutless off the line. only thing i figure can change it is a big stall 3000 or so or check the cam degree as crackedback said.

heres how i got the most out of my273.. i put big blocks in front of the tires and power braked it w/a buddy under the hood turning the timing till it felt most powerful. but still no tire spin out the hole. cam may need to be degreed.(dont run over your buddy)
good luck let us know how its turns out.