1st hand w/ AKs-5.50 SNG on FT-call all in or fold PF

[Dhani]

just as the title states...
FT 9 handed-blinds 15-30
t1500 stacks
Hero is on the button with A [img]/images/graemlins/heart.gif[/img]K [img]/images/graemlins/heart.gif[/img]
3 folds to MP1 who raises to 90.
CO calls 90.
Hero raises to 350 (just about 4x the initial raise).
All fold back to MP1 who folds. CO shoves all in.
Now, I cannot see him with anything better than pocket 10s. He is obviously putting me on what I have, but I think that he is gambling and has been caught OOP. I am sure that he can't play post-flop.
Hero calls. CO shows 7 [img]/images/graemlins/heart.gif[/img] 7 [img]/images/graemlins/spade.gif[/img]
Pot-t3130
Was this a mistake for me to call regardless of my preliminary read?