In the end, yes, I'm looking at Drag Truck. I have the SM intake on it now, and I've had a New Eddy air gap in the box for a few years now. Simple enough to swap and let the ET slip tell the story, however, we have a long winter ahead without knowing (tracks are closed till April). Thus the reason for the thread, to see if anyone else chased down this rabbit hole. My cam is 218/224 @050 with basically a .520/.530 lift. Heads are stock magnum heads but remans that I got cheap, and I guess we'll say they've been mildly home-ported by me with hughes spring kit. All else is stock 200k miles short block.
