You can probably get away with just pulling the upper radiator shroud.
The link I listed is from an e-bay seller that has the Zirgo unit you mentioned. I've bought a bunch of stuff from him and always been pleased with the price and quality.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
| 
