Help! 360 with 302 heads no compression

Its a sweet truck i picked up for 300 bucks. 92 d250, 3/4 ton. Needs a ac compressor but its all there, interior is really nice, body is really nice. Jas a goose neck hitch in the back and a regular hitch, and trailer brake. Push bar in the front, front visor and running bars. Also has a deep tranny pan. The guy was going to scrap it cause he couldnt get it running right.
Cool , BUT fact still remains: Why were 6+ original pushrods bent when you pulled the manifold & 2/ why were there valve marks on the dished piston tops, when you pulled the cracked heads ?? (Unless I read wrong earlier) Did someone prior miss a shift big time ?? - valves kissing pistons .
3/ As for that obviously too long pushrod ex Rickautos; that was no mistake...their Comeback/return service is NON EXISTANT (Speaking from experience) any comebacks & they treat their customers with scorn & arrogance, I only really buy their wholesale closeouts and/or limit to something absolutely needed or known quotiant blister type packed & then with a "suck it & see (what turns up) mindset.
Just a fair warning to others on less well trodden path in their direction.
4/ The amount of Varnish on the inside of that 360 I'd soak all bores in diesel & run a few cans of STP injector cleaner/top end lube/Solvent for a few gastank fulls, be surprised how much more it'd free up.
Still be suspicious of that slack in timing chain still: it'll RETARD your Cam timing too, so I'd run an offset Crank key 4° or Drill the back side of the Camgear for an offset button if it doesn't use a keyway Cam snout ( not familiar with Roller Cams).
Good outcome anyways, sounds like a find, your Truck & ya know, sometimes the cheapest buys turn out to be most satisfying etc.
Cheers Trev.

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