I'm going to say a few more words then drop it.
Maintaining originality is expensive, difficult and requires a lot of research. Did you know that POR-15 was not invented till 1978? Why then put it on your 1953 truck?
Using POR-15 means you want to customize your vehicle to your own taste, which is your right to do, but it also means you are not thinking of 100% originality.
If your are willing to bend a little more, you may be able to find a good running engine/drivetrain (I6 to V8 swap for example) and save yourself real $$$.
A lot of people in this forum customize their trucks but try to keep the original look. One of the biggies is system conversion from 6 volts to 12 volts.
I'm done preaching.

"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."