[ss3011]

I have seen hybrid converters with a 8" core , but a larger 298 mm clutch and front cover . That style converter has way too much inertia to work well in Stock . What might work pretty well is a 245 mm converter which is a lot lighter and only slightly bigger than a 8" Opel converter.

Personally I think you will need more rearend gear , but you can creep up on that , once you get going .

Good Luck