Can you put ls1 heads on l98 motor?

No, you can't directly put LS1 heads on an L98 motor. The L98 is a small-block Chevrolet engine with a different cylinder head bolt pattern than the LS1 (which is part of the LS engine family). They are fundamentally incompatible. You would need extensive and very complex modifications, essentially rebuilding the entire engine, to even attempt such a swap, and it would likely be far more expensive and time-consuming than building a whole new engine.