ERA is a top notch replica that replicates the essance of the Cobra. Styling is very high quality and design second to none. If the ERA was made by a pro or ERA themselves the quality will be second to none. Most of the time an ERA is correct with FE motor, Jag or ERA IRS. This stated an ERA will probably cost more as there are less and FE adds cost. Outward accuracy is 10! Made in USA
SPF is a factory made car that is designed to use Ford components with an outward accuracy of about an 8. (My opinion) Most SPF's have small block versus FE. They do incorporate a very nice IRS via Ford center section. SPF will most likely hvve top and windows as they come complete from factory in South Africa.
Both are very nice, my own feeling is ERA hard to beat. SPF are nice just less accurate from the sense of the Cobra. Driven both and the ERA feels more authentic on the road. SPF is a great choice for the masses as newer motors may be less trouble, I suggested an SPF to my father.
Either will not be bad decision............. Best of luck