Show me a pair of aluminum heads that cost the same as the iron you priced.
BARE SM $365 ea.=730.00+tax of, what..56 bucks ? $786 and you'd still have no parts and the valve job would need looked at for concentricity . $350-$380 for cheap valves, retainers springs,locks,spring cups and seals, bolts?
1100-1200 +shop looking them over.
Go for it.