IMO you should put a RAIII auto cam in it. Maybe a RAIII stick cam in if you want more lump. I consider the 268 a POS. never have been happy with them. With the intended purpose of this engine I do not see the need for a adjustable valve train either.
Might want to see about hardened ex seats if you are bringing the heads a a machine shop.
Keep it simple and have fun with it.
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