As was mentioned, I wouldn't run any smaller than a -10 line for crankcase breathing and I'd recommend -12 (2 lines, one from each valve cover, and do not "T" them together-- run either twin tanks or a single larger tank with twin inlets.) You don't want any excessive crankcase pressure issues.
Also, the larger line will have a slower velocity and will keep less oil in suspension.
As was mentioned, the "usual suspects" for off the shelf breather tanks include Moroso, Stef's, Peterson, and Canton.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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