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Other folks are going to be more help with the balancer question - I don't know the stock diameter of a '78. But this is another place where you don't need to go crazy; Pioneer is a good OEM-type brand and is resold by NAPA. You don't need a Fluidampr or something that's SFI-approved unless you're going racing or making above 1.2 HP/CID. There will certainly be other opinions, this is just mine
It's a good time to consider investing in a degreed balancer (or buy a dialback timing light), take time to verify TDC and put on an adjustable pointer. This is good prep for doing some solid tuning work per the great timing FAQ posted in this section - and making sure you get the most out of that cam swap.
It's a good pick overall - cams over .450 lift a) *may* hit the stock valve covers with the stock rockers and b) *may* encounter coil bind with stock springs. Check stuff *very carefully*
It's a good pick overall - cams over .450 lift a) *may* hit the stock valve covers with the stock rockers and b) *may* encounter coil bind with stock springs. Check stuff *very carefully*
Basic 3 position $25 Cloyes will work fine. I've been using them in these 7500 rpm 800+ hp bigblocks with tons of spring pressure and they hold up fine. Never had one fail yet.
Lots of advertising hype out there and these timing sets are a great profit maker. This is one of those areas where spending huge $$ doesn't gain you much if anything.