indy "x" heads or edelbrock rpms?

1970Duster said
The eddys would allow for higher compression (more power) because they are aluminum

He's already got a deck height and piston so choosing on the basis of more compression is a moot point.

I wouldn't buy wither set from hughes... You can get better parts from elsewhere, especially the X heads.

Of the two choices you posted, the X heads will outperform the ede's.