resto mod-ish
just so you know this is not a SBC...
there is no aftermarket head, or even aluminum for that matter...
there are guys who have boosted them and run EFI... i think the mega squirt is the only EFI besides all the other aftermarket ones... nothing really factory...
you should look up slantsix.org for more info... some of the boost guys on here will chime in...
i like mine NA...