89 LX 5.0 With 86 motor HELP

I dropped a motor from an 86 5.0 into my 89 LX. Nothing changed, comp is the factory 89. T-5 tranny. I recently found today that for some odd reason the 86 5.0's have Flat top Pistions..? I was wonder what problems could i face as far as this swap AS IS.. being as the 89 is MAF and the 86 is not. Will the comp have trouble with A/F mix or ect. and also, would it just be a better idea to build a separate 5.0 and drop it in later? Seeing as how i've got the dreams for a 347 Stroker.. Any help would be great.. Ive got a few other quirks here and there but this being my first thread, wana make sure im doin this right.. Thanks

jrichker said:

The 86 model 5.0 Mustang came with different heads (E6??). They didn't breathe as good as the later model 87-93 E7 heads.

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sounds good, also i was wondering about an E303 cam... sense the 86 has the flat top pistions, if i went with a newer model STOCK heads, would i be able to acually run the E303 without having valve piston contact...??? so mad i didnt know about the pistons b4 i dropped the motor in, but i guess you live n you learn.. (my first mustang build btw).. lol