[stephen low]

Merv

You can only use an injected engine for compliancy here to meet emissions standards, but I'm not up with how far back you can go with a US sourced 302 and still meet Australian emissions specs. One for your engineer to answer.

Looked at Paul's Harrison on Sunday and you may be able to fit the XY? style 302 engine mounts over the supports, you need dimensions I guess but importantly I have no appreciation where the current mounts will position the 302 block in your engine bay. This might be the critical parameter and I'll leave to the better informed.

A local sourced 5L with the matching bits would be a start and comply option but that's the same for the GM side too.

The T5 WC boxes are pretty robust with modern shift feel and pattern. Drag racing might test the box out eventually but normal use will see long life. The WC variant was behind the 347 stroker but the earlier 5L used a standard T5 up to and including the 200kW engine I believe. Internal difference was use of tapered bearings in the WC over standard bearing sets.

Mating to the diff just needs the right flange at the back end of your tailshaft I presume, so this is a no brainer too. (Sorry missed the ratio hint, ignore this one!! - DoH)

Cheers