You'll be running pretty much the same combo that I used to have minus the 3 cam as I was still running a stock cam. It was good for 14.18 @ 98mph in an AOD vert with 4.10s.
One thing to definetely do is change out the springs on those p heads so that they match the lift of the e cam. I do not believe that the stock explorer springs will work. I just got that trickflow spring upgrade kit for gt40 iron heads and put them on. Also I don't think that your stock exhaust manifolds will work with the p heads due to the spark plug relocation. I would hunt ebay for a nice set of ceramic coated p specific headers. It took a little while but I got a brand new set of FRPP ceramics for $150 shipped
My old combo was 70mm tb, 1.6 rr, GT40P heads, full exhaust, GT40 intake ( explorer lower, tubular upper, stock cam, 4.10s and smog and EGR delete. Went 14.18 @ 97.98. New combo is 70mm tb, 1.6rr, GT40P heads, fulle exhaust, Trickflow Trackheat, TFS stage 1 cam, 4.10s and smog delete. Last time I was at OSW I went 14.24 @ 100.03. So I am making more power but having a harder time getting it on the pavement. Hopefully my new DRs will help solve that problem.
Let me know if you need a hand. Should take about a day to intall heads, cam and intake. Not sure about mass air conversion.
It will be a lot of fun.