You have a nice winter project ahead, unless you wish to take a chance with Barrs Stop-Leak. This $3.00 tube from any auto parts store will plug up very small leaks until you can get around to a proper rebuild. Fel-Pro IMHO makes an excellent gasket so assuming you torqued the heads properly, to Boss 351 specs, something is wrong. Simply slapping another gasket on is not the way one fixes such a problem. The root cause must be found and this may be a warped or cracked head OR block. Incidently, check your oil pan as well- ethylene gycol present in the pan is very bad. Its not well known, but bearing babbit is soluable in hot ethylene glycol. It is quite possible to DISSOLVE your bearings if you continue to drive with a coolant leak down in the oil.
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