Test fit everything carefully. The cam to rod clearance could be an issue with a 4.5" stroke and Aluminum rods. Is that a raised cam core block?

what do you think of aluminium rod on street use some time ??

I had a gasket failure using that green gasket and oil pump filter plate! This was a common problem with that setup. There are only two bolts holding it on the pump and they are on one side. You can buy a one piece plate, or add a third bolt under the filter area. Best thing to do is to buy the one piece cover. Also do what you can to elimenate 90 degree fittings, especially on the intake side of the pump. Use the better 90 degree fittings made with tubing and a gentle curve if at all possible. Also very important to see if any of the fittings screw into anything far enough to restrict oil flow. I found that the one going through the pan into the swinging oil pickup was restricting the flow path on mine. Just shorten it and taper the entrance of the fitting. keep a very close eye on oil pressure . If you have problems with low pressure because of the oil pan you have, you can band aid it with an oil accumulater. I have to run over ten quarts of oil. I use thirteen with the accumulater.

I ran BME 426 forgings in my Mega Block with 4.5" stroke, only slight clearancing. Similar to Al's pics above. Former owner ran a 292@.050", I run a 285"@.050" both fit w/o issue.
Doug

It's something to check. 1mm clearance is minimum. Check the cam clearance to rods, cam end play, and don't forget to set the cam end play to .008 or so, give or take a .002 That's thousandths of an Inch.

There is a lot to check on a motor like your building. I have a similar motor. Ask as many questions as you want. These guys all want to help. We ruffle each others feathers but it's mostly in fun. We all drive MoPar!

With the thick aluminum rods you should check clearance against the camlobes. I am bulding a Hemi with Mopar rods in a Megablock, and 4.625 stroke, and had to slightly grind on the driver side rods (Eagle steel) in most advanced cam postion to make sure a thick lobed roller cam did not interfere. Less problem with a flat tappet I also mocked up. Interference point is on the rods where the threads exit. That is also a stressed part, so I do not know how much you can grind away if needed.....I highly recommend you check this first, to see if the alu rods will fit.

One thing to add, to go along with the tighter rod clearance. Let the motor get up to temp before you drive. It's all about running the motor in the proper temperature range.

ok ! good info .. right temperature ?? 190-200 F maximum ??