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Re: My 70 swb has a 327
041 heads will be 300hp 350 heads, late 60'S. I had a set till a few months ago. Thats the heads you want in my opinion... unless your 327 is built to race spec. The 186 heads have accessory holes too but hard to find. Im pretty sure the 041 heads are 64cc combustion chambers so if youre running domes or similar it might put your final comp a little high for the street.
Look for an impala from the late 60's or early 70s, the ones with the SB400 have 186 heads as i recall.
Some Dart iron eagle heads would work too 
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Chad
1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway*
1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy
1986 Silverado Short Fleet - Scarlet *Sold*
1985 Silverado Short Fleet *Sold*
2022 Jeep Gladiator Mojave
2001 Jeep Cherokee XJ 4x4 - Lifted, Built
1992 Jeep Cherokee XJ 4x4 - Lifted
2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)
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