W2 Heads on 1996 Magnum 360 Block

You are aware of the T&D rocker price...? For that money in a W2 top end, and the .550 cam you proposed, you may want to call MRL (vendor here and a great guy) and explore some less expensive options like the MP Commando head or even a ported Edelbrock head. That T&D stuff is just wicked expensive and your cam seems to be shy of the W2's sweet spot. May be a very "inexpensive" call.