Well I'll take a shot at this but I am NOT,
nor do I claim to be a experienced mechanic... Hell, I didn't even stay in a Holiday Inn last night... This is literally my $0.02 cents.
First, it sounds like you sent the heads to a professional shop, so get them on the horn and see what they advise. ($0.01 )
Second, I would never reuse a gasket, especially on a heavily modded engine... It's already tore apart and you're waiting for your head to ship back, go ahead and replace every gasket on it so you won't have to tear it back apart a few months down the road. ($0.01)
Figure out what make/size stroker engine you have and google it followed by "gasket rebuild kit". Start calling the different companies that come up to see what they would recommend. Don't buy stuff blindly, good chance you will be speaking to someone who knows your engine inside and out. Keep searching these forums too, ton's of knowledge mechs stop in. I'm sure there is more than gaskets that should be replaced while it's apart as general/preventive maintenance....
Here's your first lead: Summit Racing
list 4,473 different rebuild kits. Shoot, that's $0.03 now... You owe me a penny, Sir!