[Healeys] upgrading a healey

[Jess Power]

I purchased a 1954 100/4 BN1 in good shape.It had undergone a frame  
off resto in 1995 and the original pistons were replaced with larger  
high compression pistons with 100M specs.If I were to replace the cam  
with a high lift cam and larger carbs and cold air box following  
LeMans specs,how much would this increase the value of the car? It has  
no rust and fair interior.Thanks,Jess