I'm looking into upgrading my '81 Oldsmobile Calais with a 4.3L (260ci) V8. Are there aftermarket parts for this engine, including headers, chrome valve covers, dual-exhaust systems, intake manifolds, ...

With over 180,000 miles on the clock, the original 327-cubic-inch engine in the El Camino had gone through just about all the rebuilds and use that any engine can reasonably be expected to endure; but ...