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The only dog of my three that I would trust at a dog park.... can't go. He's deaf, and if he's not looking at me I can't call him back. And frankly, even if he WAS looking, I don't know if he'd ignore me.
And he gets so excited when he sees his leash for either a walkie or a ride in the truck...
I think the 452's is the right answer for you.
If you really want aluminum heads (they'll make more power than stock 452's, for sure) I'd revert to the 440 source stealth.
In your research, study which heads have raised exhaust ports. Would be a nightmare for your situation.
One of the guys I worked with had a Subaru 360 (cc's!)
A weak man or a strong wind could tip it on its side.
Edit: it was under a thousand pounds, exempt from the safety regs. I had a Kawasaki 1300 that weighed about the same.
I used thousands of socket head capscrews, and many hundred button heads, in my business. Never had much problems with them stripping out. (Everything from 6-32bh to 1/2-13 capscrews.)
I did round out a few of the smaller Allen keys. I think the,bolts, even button heads were harder.
So it wasn't bad enough that they developed another bolt style for no good reason except to sell tools, they had to develop ANOTHER version of the same unneeded bolts, to sell EVEN MORE tools?
What can torx do that Allen's cant?
Yeah, the narrowed nine is something you probably should have mentioned, lol.
Once a rear is narrowed, "normal" does not apply.
(My narrowed nines are under 40" disc face to disc face, and not in the muddle of the tub, lol)
You can get away with a too-big carb, or a dp, easier with a car with a stick, or a stiff rear gear. And having a light car certainly helps too.
I run an 850 dp on a small block..... but I have 4.57s, a 5000 torque converter, and 2300 lbs.
If you are gonna try a double pumper, I would...
"Double pumper" refers to a holley style carb (LOTS of companies make em now) with mechanical secondaries, and an accelerator pump on both bowls. (NOT merely a dual inlet carb). Slightly more of a race-style carb than a vacuum secondary version.
There are tuning options galore for vacuum carbs...
I have used 800-850 double pumpers on all my "fast cars" for years. Even ones with auto trans.
But mine have around 500 hp, 3.91, 4.10, or 4.57 gear, 5000 converters, and mileage means nothing.
You could experiment with a 750dp, but I think you'll be happier with what you have now.