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Yes
Yes
The headers would be the same anyway, so you can order headers for the 83 and be all set.
No, they're 2 totally different bodystyles
Junkyard El Camino's are getting hard to find even in junkyards.Gm classic parts on Ebay has allot El camino new & used parts
Yes, there are a few suppliers for them both chassis and fender well.
They are both on the same A-body platform so it should work
No , the only compatibility for a 1970 Chevelle is a 69-72 Monte Carlo, Chevelle, El Camino... hope that helps...
No.
What engine and car they were designed to fit.
no, 1973-1977 was the same, 1978-1981 was the same, 1982-1986(87) was the same, you can always jury rig, but it wont ever look right
block hugger headers