Have to realize he is in Saudia Arabia , might be big challenge ($$$) on ship, import/export BS. . Clean-up porting will not hurt. I have seen U-tube of some bad ass Banshees dragging in Middle East (maybe S.A.) Another thing to cosider is that he is already on his last bore (66.5) so he does not have a whole lot to loose. 9090, do you have any other modifications on it ? Pipes ,carbs, timing? Might also do those for HP increase. Also saw you have 4mil stroke ,do you have 2mm spacers under cyls , 2mm head gasket , rechambered head , or coolhead with stroker domes?