Time to Fix It Right

Tuning any combo correctly will always help. Buy a dial back timing gun and a vacuum gauge (I have a Harbor Freight one, works fine for me). I like the guns with a tach built in. If your more flush buy and install a wide band O2 and gauge, AEM makes some nice ones that are not too spendy. All of these move forward with any engine you build so they are worth having.

Honesty I for one don't like taking an engine part that runs unless there are internal issues.

Just know that with that 280 cam you'll likely get lower numbers if you do a compression test. It will be how even they are to one another that counts to some degree.