440 Running like garbage

[Stacked440]

Well, the 71' is back on the street sporting a new aluminum cross-flow radiator, electric fan, and even a Keisler 5-spd.  The problem now is at higher RPM's it spits and doesn't want to rev.  And kind of funny but, tonight my dad blew up one of the mufflers!  Completely destroyed it, blew open like a party popper.  To much raw gas in the exhaust i guess   It's only recently started doing it, and we've tried monkeying with the timing and the vacuum advance but nothing seems to make a difference.  Any ideas?

[Chryco Psycho]

all in the tuning , what color are the plugs where are the float levels set , what si the timing advancing too , if you have vacuum adavnce is it connected to intake vacuum [Wrong] or ported /venturi vacuum /
 we need some hints

[Stacked440]

I think I'm going to pull a plug out today or tomorrow and just take a gander at whats going on inside.

[Stacked440]

Last few days it has been running VERY rich.  Maybe jet size in carb to big?

[Chryco Psycho]

could be












jets , leaking power valve or gasket , float level , or just normal if you have a long duration cam