call TA. it is done but there are a couple of variances between the 455 and the earleir engines. the 430 uses smaller pushrods, oils through weepers in the rocker shaft, uses smaller head bolts and, i think, has a different water passage.
being 67, you might have 'big port' castings as well as the smaller comb chamber.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)