...you say every engine is a compromise...it doesnt have to be....yes i can see Rod's is with the top speed mind frameset.

The bit you missed out from your quotes is...an engine should be properly specced enuff to be able to consume all the air that turbo can give at any rpm of its range.

I concede,as i practice not preach,my 7.1-1 engine with a T4 that vcould only run 1.5bar before surge was utter shite ....but i learnt from there on...open the fooking ports and bin the bd10's for this application ...to me my 7.9-1 engine was a no compromise unit with the T4 and 4 x 1000cc injectors....could take 2.3bar at any rpm of the boost area 4k to 8k ...with nice off boost driving...as a road car it didnt get any better imo.