I have used the same gas lines & tank for 4 years with a small 400 it was ok, same hi end plug wires, new plugs gapped around .055, new generic HEI dist. (not to sure about that either)stock 46 heads, 15" steady vac at idle. rear end 355 with 2004r trans I have used for 2 years. Carb rebuilt quadrajet. timing set to 9 degrees @ approx 800rpm. Main problem is acceleration,it drives fine, i've had it upto around 60mph & engine runs smooth. I'am going to try a 750 edelbrock carb this weekend.