Tunnel ram guys. A few questions please?

What size carbs are you running? I have a stock stroke 340 with ported x heads and a .509 cam put together for an old school build. The tunnel ram on it right now has 450’s? I know they are Holleys, but really not sure of them. Would like to mount them sideways, because I think it looks cooler and would suit the build better. As I understand, the 450 only has jets on the secondary side? The primary is adjusted by a metering plate? I’ve heard that 660’s are a great choice, but are pricey brand new. I’ve got no problem running what I have for now, but would the linkage work mounting them sideways? Thanks for any help and replies!