EMS??

there is doing things on a budget and then there is fitting crap!

I would go the V8 personally , get a AU motor but

The reason I didnt include forced 8 is because it wasnt an option for me (budget extends to engine swap or turbo but not bpth). And I get the impression xrdismantler thinks EMS is rubbish. Ive heard they do a reasonable job (any reason they are crap or you just brand biased?).

Yeah Ive seen good results from EMS ecu's, though you dont see them as commonly used as others, is there issues with them?

Remember 5.0L Windsors are far more reliable than the 4.0L six, but dollar for dollar go for the turbo six.

A well setup turbo six will be far easier to drive than a modified NA 5.0L that is producing about the same amount of power and you won't have to put up with the shaking from rough idle caused by the camshaft profile required to produce that same amount of power.(I used to get sick of that while waiting at lights).

If dollars weren't such an issue, turbo a V8, start with a 220Kw engine and see how long your drive line doesn't last

5.0L has a 500hp block limit, that is 373kw@ the flywheel, but huge torque could be produced not far off idle due to engine capacity, this is where the V8 will shine over the six, if the V8 owner wants more, they either need to go aftermarket or pre roller block, where the six owner doesn't need to replace the block.

Stock 165Kw engine with turbo/s will still perform well, remember you are forcing air in, not relying on atmosphere pressure pushing it in, ports etc won't be as big an issue, performance will be gained from intake, GT40 heads etc but it will be still big power, more than most could totally control. I has been done here and overseas.

It would be interesting to see how far the 4L block will go. Whats the best power so far? Can we count the Nizpro 1000hp setup?

Well, my plan is too see how much boost my stock 3.9 will take, the T4 I bought is good for 30psi all day... but I dont plan on a 30psi daily driver LOL, 15psi for the street. Ive heard of 400rwkw from a stock 4lt, that was with a T7 though.
its rpm and tuning that will end the motor, so if it stays under 5000 it will live longer

That engine ultimately made 1223 hp and 1376Nm.

What engine is that? Does anyone have more info?

Yeah mate that's Nizpro's little project.

Vids here:

http://www.nizpro.com.au/media.html

Or search around for it - plenty been written on this thing.

Ever seen an exhaust glow like that?!?!?! lol

That is awesome. Its a BA engine though. I wonder how far the SOHC has been taken?