Think what Mike was saying Tricky is that 100lbs is a fair difference between the engines, not that the performance wouldnt be worthwhile.
Tanith how come your not going for a twin turbo setup? Obviously the V8 will sound But is it really worth it when a twin turbo will give you the same, if not better, performance for minimal effort Seems a lot of hassle for limited gains over FI. IMHO obviously. If its the challenge factor and individualism it wil bring then fair play too you, its going to be one hell of a mean sounding zed
Best of luck