Not quite sure what you want to do here...

Pull the L98 and install a Vortec 4200?

or

Pull the L98 and install something else ?


If you want to install the Vortec 4200 then you most likely can get help here, if its not made by Detroit then I suspect not many folks here have experience with it.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them