401a rollover??

[SlowTwitcher]

I have an account with a previous employer that I would like to rollover, eventually into a Roth IRA. It is a 401(a). The part I'm confused about is that my contributions were after tax; it has employee matched funds; and of course has grown some due to capital gains, etc... Can I roll this? Do I pay taxes on the employer match and the gains if rolled into Roth??

Thanks for help/advice,
SlowTwitcher