How Big can a 5.2 get?

Jadaharabi said
Personally I would go with the 1.92 intake valves.
Odessa heads does a lot of advertising and sales on eBay.

you might look into the Indy cylinder head arrowheads. Part number, 360 HI-MAX. Priced at $995.0.

The 360 HI-LAX that uses the LA manifolds.