[SS79chevy]

have to agree its a mismatched combo the cam you are runing is a pretty mild cam already id stick with it but it needs about a 9.1 to 9.5:1 compression ratio and your runing around 8.5:1 depending on the dish of your piston that could be more or less and your over carbed demon 750s thend to flow like holley 850s that setup really only needs 650-700cfm i would go with a dubble pumper over the vacum secondary as well as for the timing iv found that sbc's like it in the 36-38 degree range total

if it where mine id bump the compression to around 10.1 and probly run a 700-to 750 holley