The 351w wasn't roller ready until 1994(F4TE casting number).. and was found in all F and E series trucks.

Converting an older block to roller isn't really cost effective, the linkbar roller lifters required to run a standard roller cam will cost at least $350, and then you also need pushrods and most cams run $250 or more. You can install the factory roller assembly(spider and dogbones) if the engine is being torn down for a rebuild..the valley has to be drilled and tapped for the spider retainer, but then you have to run a small base circle cam which will cost at least as much as the regular roller and there really isn't much selection. Compare all that to a flat tappet cam and lifter kit which will deliver the same power for as little as $100.