Oval port headers with square port heads ?

I have Hedmann 88300 headers which are oval port for my '66 mustang and I'm looking at getting a set of Edelbrock e-street heads that have square ports on them. Previous heads were stockers that seemed more rectangular in the ports.

Will there be any issues sealing between the two? Plan on using Taylor seal-4-good header gaskets.

I was able to get ahold of Edelbrock tech support and was advised that the 1 5/8 primaries are a minimum for these heads, 1 7/8 and 1 3/4 work as well. For anyone else who may need this info.