Head gasket help.

[VintageMusclecar]

If the block does not have the three holes in the deck surface just above the lower row of head bolts, it is a "series cooled" block and would take something like a Fel-Pro 8180PT2:



If the block does have the three cooling holes above the lower row of head bolts, it is a "parallel cooled" block and would take something like a Fel-Pro 1037:



Hope this helps.