Are these the right heads for my wife's car?

[david.skinner]

There are a set of 81A heads for sale in a town close to where I live.

http://www.trademe.co.nz/a.aspx?id=1101935909

My wife has a 36 ford pickup with what I believe is a 38 engine in it.
it has:

24 stud heads
long snout out of the front of the crankshaft
Radiator fan mounted on the end of the generator
the pencil lip above the distributor
the heavy (not recessed) inlet manifold
the oil pan freeze thingy marks (which I don't understand).

However it currently has two different heads on it and I'm pretty sure they are different compression heads. When I ran a compression test I got dead on 80psi on the left bank (which I think is a truck head) and 100psi on the right bank. The head on the right bank has got made in Canada stamped on it. I'm keen to put on a matching set (cause I'm like that), but I want to check the heads will fit this engine so any advice on how to check this would be appreciated. I believe the seller is a member of this forum as he mentioned Old Henry in his advert.

Thanks in advance.
David