502 heads onto 454?

[*rayman*]

Will 502 heads go on to a 454 block ok? I thought this might be a cheap way to upgrade from my oval port heads i currently have. These are obviously a squre/rectangle port head on the 502, so i would require a new inlet manifold. Will i see a significant gain by using these heads? or should i not bother and go with an aluminium edelbrock or afr head?

I can get a very low k/m pair of 502 heads for $650, as opposed to $3000 for aluminiums.

I know the 502 have a taller deck height on the block, but will the heads match up to the 454? I plan on running an F1-R procharger setup down the track, with a mild street application.

Thanks guys.