Pull a valve cover and look for valve stem seals. Either there are none, umbrella seals of the seals aren't on the guides but rode up the stems.
Shop probably knurled the guides, which is only a temporary, cheap fix. Old school cheap way.
Why is the arm of the brake pedal and the e-brake rusty??
Attention to detail? Not in my opinion.
Nice build, but not my preference.
I think the builder saw a cash opportunity and convinced her to dump a pile into it..
Whoever made the video is amateur and the company owner constantly...
Amazon
The Stop Shop Stainless Steel Fuel Line Coil Roll 5/16 Inch,16 Feet With 4 Steel SAE 5/16" Fittings Included, Made in USA https://a.co/d/7eqpT1K
Make sure to have a drain pan under the tail shaft of the transmission and have the rear axle height elevated as transmission fluid may tend to drip out the tail shaft if level is full.
You have your answers above. You have to measure the stroke of the pistons/crank. And get the engine casting codes above the starter if the 302C block used a different casting than the 351C. That one I'm not sure of.
Those that complain about the pricing have never known nor understood what an investment of time, money and energy it takes to bring a product from concept to drawing to prototype, find suppliers for material and find a vendor willing to produce something to your specifications while paying...
I just received an email this morning from NPD stating they have the Ram Air correct flat springs reproduced and available now!
https://www.npdlink.com/product/spring-hood-hinge/205419?backurl=search%2Fproducts%3Fsearch_terms%3D16789-5A%26top_parent%3D200001%26year%3D
No affiliation with NPD...