I have an uncut one that I have had from the beginning.  Build fell through that it was planned for.  Would need to be finished machined.  Small holes where ports go.  Joe-JDC 

I've removed the hole dividers in several types of intakes and helped with the flow distribution and balance.  Boss 302 and Boss 429 intakes benefit with a dual plenum over the four holes.  428CJ does, also. The 312Y intake really works much better with dual ovals.  Joe-JDC

Looks a lot like the spacing on your heads.  Joe-JDC

If your engine is truly a 57K mileage and never been into, then you should definitely think about changing the camshaft timing gears and chain.  You can still find C6AE-9425-H aluminum intakes and C7AE-F intakes with the thermactor tubing holes and remove about 50# from the engine.  735 cfm Holley and FPA headers, and 2 1/2" exhausts and call it good for the street.  Joe-JDC

Thanks, everyone.  My wife has had two back surgeries and is still healing but she is feeling much better.  I just had a large skin cancer(BCC) removed from my left temple, and the stitches are just about healed over.  We are optimistic that things will be better real soon.  I have a few projects still in the shop of my own, a 289 that I was going to take to 2019 EMC, a real Boss 302, a 468 Shelby FE, and a 302 stroker/354ci that is almost complete.  Just got the pushrods in yesterday for final assembly and off to the dyno.  Joe-JDC

I have been getting folks from different sources asking for port work on heads and intakes.  I have come to the point that my age, and my wife's health require more of my time than the work.  I have enjoyed this Forum since Jay began it, and the old FE forum before that.  I hope I have made many friends over the years and helped folks with odd jobs that no one else wanted to tackle.  I have met several of you including Jay.  My home shop became a place to meet many good folks after retiring from a local race shop.  One of the folks I truly admired was Karol Miller who set some records with the Ford Y block back in the '50s and early '60s.  He has been to my place a couple of times, and dubbed it "Joe's Skunk Works".  He sent me T-shirts with his '56 pictured on them from Bonneville, and a nice picture of him standing by my SF-600 flow bench.  He passed at the age of 95 and is missed by those who knew him.  Anyway, my son gave me a nice birthday gift a few years ago after Karol sent me the T-shirts.  Here are a couple of pictures.  Pictured is 1508 Y Block horsepower.  Joe-JDC

Are you still running a heater with lines to the heater core?  If so, then turn the heater on and see if the temperature comes down any.  If it does then you need to speed up the fan or increase the fan size or make sure it is positioned correctly to the radiator and in the shroud properly.  If you are bypassing the heater, then pulley size or speed will be suspect IMO.  Joe-JDC

If you drove it 18 miles without an issue, and then after sitting for a bit and starting it up again it developed a problem immediately, I would look at valve guide clearances.  Especially if only exhaust rockers or pushrods.  JMO, but look at that, also.  What is that white substance in the intake ports?  Thread sealer for the studs?  Make sure you remove that before installing the intake next time.   Joe-JDC