heres what i have.... 1978 z28 camaro. 400+ hp 400 SB. 4 Sp trans. 1970 ls6 BB q-jet. stock style fuel pump stock style distributor heres what is does... ST gear (shift about 5000 to 5200) no prob. ND gear about 3000 to 4000 (rpm's) she falls flat on her face. if i let up for a few seconds we are back in the back seat. a few buddy's of mine say it's a fuel problem. but i;m not sure. i have a aftermarket holly fuels pump (12-834). but it does not have a nipple to hook up the return line. any ideas on a new aftermarket fuel pump???? i want to stay with the mechanical. could it be something Else???? any input will be helpfully!!!!!