Thanks! FTR, they both leaked a couple drops at the firewall corners when started, but quit when warmed up (could prob fix it by snugging those corners down a bit more due to heat cycling- heads were aluminum also). I ran the orange silicone gaskets sold by Marsh Superperformance. Also used an ARP stud kit (2 sbc kits).
Need a thinwall deep socket due to angles on a couple. Breather is an Edelbrock item.