I have a 347 Stroker motor 9.7-9.8 compression with AFR 185 heads (don't know what CC I got) and ported Edelbrock RPM. What other heads thats out there will lower my compression? I've been trying to sell my motor to get another one with a bit lower compression so I can start on my single T70 turbo. I guess I just try to lower it as much as I can with this motor but need some help.