LT4 came only in 96 vettes, and 100 '97 SS and 29 '97 TA's
Besides differant heads/intake/cam/block, its pretty much the same as a LT1
check out [url]LT4.com[/url]
BTW doing the "conversion" like me, or Mike, or anyone else with LT4 parts, is only the heads/intake and usually a LT4 "Hotcam" so its not really a LT4 conversion