NF or 7A block substitution

[Ben Swann]

What's involved in using an NF block as a substitute for the 3B?  Just the
034Headgasket?  I have 3B with a rod poking into the exhaust manifold due to over-rev
with no load when the cruise control rod slipped and jammed WOT. 

I have an NF block sitting here and complete rebuild kit on hand bought and paid for, so
thought I could use this as a replacement at least in the short term

Ultimately the car may get a twin-turbo 3.7l V8 I'm building, but need something to get
this 200 on the road quickly.

Ben