Im thinken about pullen the standered motor out and working it, but i just want to throw a few options up at the moment, im just lookin to find out deatiled specification about this engine, both top and bottom...
best bet would to get your self a workshop manual you can get them off ebay for 10 bucks i got one 3 years ago on cd and it works great........
this might help a little but not very techincal
Holden VT Commodore Specifications
or try come racing or crow cams they usaly got something that can help