304 timing and vacuum advice
Looking for the Ideal vacuum pressure at the ideal timing for a 304 with a holley 450 4bbl carb and 4bbl intake. I do not know if the cam is stock or not, I have read 5-8* BTDC is ideal, but I don't know. I rebuilt the carburetor but am still getting a carb backfire and do not know if I have the air fuel set properly. It will idle all day fine, but as soon as I rev it to move it I get a bog and a loud fart out of the carb before stalling. I know I rebuilt the carb right, done many in my day. I have little experience with a vacuum gauge, but don't know what kind of pressure I am supposed to be looking for and at what rpm, timing, etc. should be set at.