Re: Early escalade conversion kit for 73-87 gen trucks...
Not likely; the popularity of the swaps you mention is because it is easy to fit the SUV front end to the pickup of the same architecture (ie, a GMT800 Escalade onto a GMT800 pickup, or a GMT400 Escalade front onto a GMT400 pickup).
Since there were no luxury SUVs during the squarebody timeframe it would be a major cut/cobble job to get the later versions to fit.
MHO -
K
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