I don't get it you have great heads and want to go solid roller, but you got a free magnum block so you would rather spend $1000-$2000 on a new heads instead of a $100-200 on a block or maybe a trade.
Good point, the only benefit of the roller block imo is saving money in the hyd roller lifter depot 'u can use stock lifters', otherwise solid roller lifters cost the same as if u were using a LA block...
there could be a way to plumb some oil to the shafts if one wanted to tap into the top of the cam bore and run 1/4 hard line up between the push rods and tap into the side of a rocker stand...