I am in the process of returning my 56 Victoria with 292 and Fordomatic back to original by switching back to the originjal A manifold and Holley 4000 . I have rebuilt and modified the carb to run with the later distributer and have replaced the heat tube in the manifold. Why am I going backward with the swap? I have run a 450 cfm Holley with manual choke on a B manifold for several years and have been happy with warm weather driving. On the other hand, even in mild Tulsa winters, cold weather driving has been a challenge, especially at stops before the engine has become warmed up. The holley carb was intended for a 289 and as my spark plug readings showed pure white without any hint of brown, I think my Holley might be too lean for the 292. I tried adding the heat riser valve a while back and it didn,t help and only made my exhaust pipe hang low enough to rattle against the frame. Anyway, I am hoping the swap will enable me to have a better cold weather car that I can walk away from while it is warming up and not have to do brake stands at stop lights. I was wondering if anyone knows if a phenolic spacer is available for the Holley 4000. My purpose would be to avoid vapor lock on hot days. Also , would I hurt anything by leaving out the heatriser valve. By the way, I am not a hot rodder and desire a car that runs as smooth and efficiently as it did when new.