Roller Motor?

[powerdUP]

hello all,I just signed in under new members. I have a couple questions for ya.I have a 91 RS camaro with a 1994 ,350ci (bored .040 over)out of a pickup, thats all I was told,(#14093638) its been all rebuilt ,from the bottom up. They used the 305 heads from the original motor.?? (dont ask) SO, I now have a set of LT1 aluminum heads ready for up to .550 lift, and a Lt4 hot cam, which will give me .525 lift w/1.6 rockers. I want to have all I need ready to do the swap with as little down time as possible.
First, could this be a roller motor already, what is the easiest check to find out?(pushrod length?) ( Because I will need a set of roller lifters). Will I need a different timing chain or gear set with a roller? I hear I need special head gaskets for aluminum heads and bolts as well, is this correct? Again , this a very low miles motor, so if it is a roller already , I could use many of the parts...
Thats all I can think of right now....Thanks fellas!!

pUP