496
The 088 is similiar to the 188/990 and would be a step up from the 049/781 because of the rectangular ports extra flow potential and the bigger valves.
They take a diffferent head gasket than the older heads, but otherwise everything interchanges. Good suggestion. Should get a 496 up to 6500+ before they stall out. A custom grind roller cam can make or break the combination with these heads.