Yes. Dont matter. the calculation will be the same. 12.5% 490cc. It still drop around 38psi at curb idle with vacuum. vacuum off at 47-50psi. Make sure is around 38-40 psi at idle with vacuum on *no more no less* Adjust pressure accordingly with standard values 47-50psi. if you not getting pressure right double check the fuel pump housing the plastic return line, you made it bigger? If not you should!
This base if everything is on point. should get you leaner after close loop kicks in. Like i said dont trust to much the ROM you have. If you could get the same rom but a very stock one with big map would be a plus.