I run Indy EZ's on my 493 but If I were building it over again today I would have gone with Trickflows. They are a much nicer casting and they would require less cleanup to make them really nice. Either way I would buy them from someone who knows race cylinder heads to give them the once over before you install them. They look like you could just bolt them on out of the box but it's best to have them checked before you bolt them on
I would really re-consider the choice of rods though and you will need to balance it anyway with those light Ross pistons.

Gus