360 Head valve spring install questions. Comp cams 995-16.

If you're pulling the heads, you'll need a spring compressor that will hold the valve and compress the spring, like this:KDT383_1200Wx1200H.jpg
If you're doing it with the heads still on, you'll need a way to keep the valve closed (via air or the old rope trick) and a valve spring compressor that bolts to the rocker stands. I'm not sure about the stem seal and the ID of the spring, but I wouldn't think it would be an issue. You'll still want to check retainer to seal clearance to make sure nothings hitting and they have plenty of clearance. Another word of caution: I would recommend buying a better set of lifters than the Comp lifters. Myself and many others have had lifter failures from Comp and I tend to shy away from them. With the 1.6 rockers you need to make sure you have plenty of retainer to seal clearance and piston to valve clearance. I would definitely want to check the piston to valve clearance with this lift, regardless of rocker ratio. An easier spring to install might be a PAC single spring, just find one with similar open and closed load, plus the spring rate.