While both are 350 small-block Chevys, there are key differences:
* Vortec Heads: The 1998 Vortec engine has significantly different cylinder heads with a different combustion chamber design, intake port configuration, and valve arrangement. These heads won't bolt onto the 1994 TBI block.
* Block Differences: Although the general block architecture is similar, there might be subtle differences in the block castings themselves (e.g., location of bolt holes, lifter bore sizes) between the Vortec and TBI engines.
* Crankshafts: While the crankshaft *might* be physically similar in overall dimensions, the crankshaft's counterweights and possibly the rear main seal design can differ. Using the wrong crankshaft could lead to balance issues or oil leaks.
In short, while some parts might be *similar*, swapping blocks and crankshafts directly is not feasible or recommended without significant modification (which would likely be more expensive than finding the correct parts). You'd need to carefully examine the specifications for both engines to even begin to assess the feasibility of any swap, and even then, it's unlikely to be a straightforward undertaking.
