For the same price and less headache you can have a Vortech/Procharger setup and be much more reliable same amount of horsepower, and only being a built short block build away from being a very powerful car.
A pushrod swap can be done but as Socal mentioned, be ready....as long as you know what to expect as far the time needed, money, headahces, odds/ends...than go for it.
I am still contemplating swapping a 351 into mine, only because my dad has 2 blocks laying around and enough parts to put one together, but at the end of the day I could get a used PI engine and a used supercharger setup for less money, less headache, and more power.
Matthew 26:52-54 / Go Pack Go!
1987 Mustang GT Hatchback - 2V Mod Swap In The Works
1997 Lincoln Town Car, PI Intake/Cams, Sofa-On-Wheels, "Fat Tony" we call it
2001 GT Convertible - D1SC / Geared / Cammed / 440wh 400wt - TOTALED 2/2019