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Your 327Q would be very similar to this 350Q, and you're looking at pretty darn close to 1,000 pounds when you consider the added weight of oil and water in the block.
When you ask whether or not a 4x4 will hold it, we need to take into consideration what the span of the 4x4 would be. I'm an overkill guy when it comes to structural safety issues, be safe because dropping a 1,000 pound load on the fiberglass hull might not be too much fun!
I looked in the Paragon manuals and they seem to have everything but the weight. From experience, even the little HF7 in my 20' Skiff is very heavy, I think it is right around 100 pounds. I could actually lift it momentarily, but I could not put it down. I had to lean against a wall and slide it to the ground. Not too smart, so I quit while I was ahead.