Angle plugged heads or straight? I think they offer both. I had them in 440 iron head 68 dart and remember no# 6 burned through boots all the time. No sure if they interfere with the plug location.
Ian
Over on Bigblockdart.com there was someone who used b or c body manifolds for his 505". He had to machine the mating surface(flange) alittle to make them work. Looked factory. It was years ago though. I believe it was a 66 model year.
Ian
Lower the motor and trans with k-member. remove necc header and repair freeze plug. Re-install header with new gasket. Lower body over engine and trans. No hassle and easy to work on. The k-member acts as a engine stand. Should be on road in no time at all. Just my 2 cents.
Ian