Not to say anyone is wrong here but i personally have bolted up a set of lt1 vette heads to a performer RPM intake and the motor ran but the problem was that the LT1 heads was that they were 56cc's and the pistons were 12.5:1 with 76 cc heads. Not very compatible i think it put it over the 13:1 If your going to run those heads just make sure the compression is a little lower and that centerbolt valve covers wont work with many type rockers but they stock type im sure theyre are some that will work but i havent seen them i just pulled the heads and called it a day. Oh yeah make sure you use the correct head bolt also. If you look at the intake you will notice that everything lines up except for the one water passage on the heads i think its in the front of the heads, that water passage is there on the intake but the heads is blocked off and if you have high dome pistons you will have a problem with clearance as far as the spark plug shroud ( little square block in the combustion chamber just under the spark plug hole) As far as roller lifters, YES ROLLER LIFTER PUSHRODS ARE SHORTER THAN FLAT TAPPET PUSHRODS But, i like to see things to believe it. if in fact that block is a 94 then its is a roller motor. Oh by the way the motor was a 383 that i used the vette heads on let us know how it works out for ya