318 roller engines best source ? not magnum

What vehicles were the best source for a 318 roller engine ? What years, what bodies,etc. Did 1985 318 from Ramchargers use a roller block? was told this but do not know it to be a fact. If the 1985 Ramcharger 318 is a Roller block,.. Would the bosses be drilled for the spiders? if not, is this something that I could do myself ?