stroker??

Right guys, due to cost of balancing here in UK(£400/$650) I am selling some parts, putting a bit too and buying a stroker kit, I wont have enough for a scat setup from Brian/Adney but will have enough for a budget kit using Kb's etc. The motor is going in my purely street Cobra rep, my quandry is do I go with a 4.140 and then regret going 4.5? or do I go with 4.3 and edge my bets? there are very few 500+ Ci cobras(street) in Uk so I do like the idea of having something fairly unique over here, the cost of gas is prohibitive here anyway so 8/10/12/Mpg? it makes no odds, the block is a fresh +60 so that will dictate things to a degree, what do you guys reckon?? :roll: Thanks Dave