Full Length Sub Frames???

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I am looking to get some full length subframe connectors for my car. It hasnt had much done to it yet but i plan on some AFRs and and a cam shortly.

I am wondering if the full lenth connectors allow you to jack the car up on them or not? I seem to remember reading that the kenny brown ones were made to do this. Im just wondering about others since i dont have quite that much cash for the KBs. Im thinking of going Steeda or somthing simular.

Not that jacking the car on these is a big deal breaker or anything.

I assume i will want full length with the seat mount bolt for the max protection and not just the shorties ?
I want to make sure i do it right. Im looking for a good welder at the same time. My mustang hasnt seen much road in the last 8 years and i want to get back into the sport and the car now that im settled.