Need spark plug recommendations

If you like NGK plugs I would try these NGK R5671A-9 if using dome pistons. R5672A-9 for flattop pistons. These are 5/8 hex 14mm thread. 3/4 inch reach plug. which I believe is correct for stealth heads. (same as E-brocks) The -9 is the heat range. The higher the number the colder the plug for NGK's.