Fullthrottle is the only one that has a roller that just needs springs changed.
Every thing else you will need to modify the guide to except the extra left. I seen somewhere a 3800 cam install but I think a bunch of mods needed too.
I had a local shop modified mine payed way to much and after about a year all the valve seals fell off and started smoking.
I went with a set of Champion irons no regrets.
I've loved the 210/215 roller with my TA49 spinning to 6k. Combo matters, other more qualified builders will comment on factors that fit this question more but I have max ported stock heads, intake and eliminated a lot of back pressure.