tubular kmember question

I found a tubular k member for a fox for $100 but the problem is he's not sure of what the make is and that it has no motor mounts because it was used with a motor plate for a SBC.

My question is could I just slap some motor mounts on it and drop it into a fox or will this no fit a fox with a sbf motor? I don't know much about motor plates and kmembers only installed a qa1 one before in a 91.. was thinking about picking this up and putting into my 88 but I don't have a sbc motor lol so would this work for me or am i wasting money?

thanks for the help