Of the 2, I'd probably go with CHP.
Mark O'Neil, the owner of CHP, does a lot of posting on the
Hardcore 5.0 forums. He seems like a decent guy that takes care of business. Lots of guys on that board use his stuff.
Keep in mind, you are likely to find good and bad about every company. Just need to sort thru it all and make your best decision when doing mail order engines.
I thinks it's always best to try and work with a local machinist/builder.
Good luck.
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