[SFfiredog]

the small cracks between the spark plug hole and the intake seat are common on hi-riser and tunnel-port heads. I have used heads with these cracks with no problems but the heads had new intake seats installed in them.
There are two different styles of hi-riser 2x4 intakes. The early manifold has a staight plenum connector between the carb pads and the later manifold has the connectors angled down towards the center between the carb pads. I have seen cherry intakes of both styles sell for between $1000 to $1500
--Mike