[CAL 58 GMC]

NICE FIND!!! Those Offy manafolds are hard to find. I know a guy that running one in his 55 Chevy wagon. He has two 500 cfm Edelbrock carbs. He drive it on both the streets around town and on the highway with know problems. He had to run vacum lines from both sides into one to keep it from loading up. I notice someone has already installed the nipple fittings on the back of yours. Just make sure if you go with a electric chock, just have it one of thr carbs only.